MCSEM勘探发射电流扰动实验仿真研究与设计  

Experimental Study and Design of MCSEM Exploration Launch Current Perturbation Simulation

作　　者：田乙涵 李肃义[1] 高泽华 TIAN Yihan;LI Suyi;GAO Zehua(School of Instrumentation and Electrical Engineering,Jilin University,Changchun 130061,China)

机构地区：[1]吉林大学仪器科学与电气工程学院,长春130061

出　　处：《实验室研究与探索》2024年第8期67-71,87,共6页Research and Exploration In Laboratory

基　　金：科技部“十四五”国家重点研发计划(2022YFC2807904)。

摘　　要：海洋可控源电磁法(MCSEM)勘探中发射电流质量是影响接收信号质量和勘探效率的重要因素。基于COMSOL Multiphysics虚拟仿真平台,研究了MCSEM勘探发射电流强度和形态参数对电场响应强度的影响。结果表明,发射电流强度的不稳定波动会降低接收信号的基波和谐波分量电场响应强度,主要影响中远偏移距电场值;发射电流波形的上升和下降沿的增加对接收信号基波和低次谐波分量影响较小,但会显著降低高次谐波分量的电场响应强度,主要影响中近偏移距电场值。通过仿真分析,MCSEM勘探中发射电流变化对接收信号的影响,可为实际勘探中发射波形异常时振幅随偏移距变化曲线的解释提供帮助。The quality of transmit current in marine controllable source electromagnetic method exploration is an important factor to affect the quality of received signal and exploration efficiency.Based on the COMSOL multiphysics virtual simulation platform,the effects of transmitting current strength and morphology parameters on the electric field response of MCSEM exploration are investigated.The results show that the unstable fluctuation of the transmit current strength can reduce the strength of the electric field response of the fundamental frequency and harmonic components of the received signal,mainly affect the value of the electric field at the middle and far offset distances.The increase of the rising and falling edges of the transmit current waveform has a small impact on the fundamental frequency and low harmonic components of the received signal,but it significantly reduces the strength of the electric field response of the high harmonic components,mainly affects the value of the electric field at the middle and near offset distances.Through the simulation and analysis method,the effect of the change of transmit current on the received signal in MCSEM exploration is analyzed,which can provide help for the interpretation of the amplitude versus offset distance curve in the actual exploration when the transmit waveform is abnormal.

关 键 词：虚拟仿真平台 发射电流 电场响应强度 接收信号 偏移距 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]